By Jake Donovan - Eight-and-a-half years later, a great rivalry finally gains a definitive ending.

In a wild fight that saw both fighters hit the canvas, Juan Manuel Marquez had the final say with a vicious one-punch sixth round knockout of Manny Pacquiao in their fourth fight Saturday evening at the MGM Grand.

The one shot – a perfectly-timed counter right hook – took the fight out the judges’ hands for the first time in their tetralogy. Fans of both fighters insisted their guy to be 3-0 in the series, with each of the previous three encounters being that close and debatable.

Part four threatened to go down the same route, though less to do with outboxing each other and more to do with who can inflict the most harm.

The answer to that, surprisingly, was Marquez.

Pacquiao jumped out to an early lead, taking the opening two rounds with speed and movement. Marquez didn’t necessarily have knockout on his mind, but certainly fought with the mentality of a fighter who wasn’t going to fall prey to the judges any more in this long-running series. [Click Here To Read More]

It had to end this way!! What a great ending to the greatest rivalry in boxing history! I'm sad that Pac lost but I'm happy to have this closure in the rivalry. I'm happpy I got to witness all 4 fights!!!

Congrats to marquez and to my comrade Pacquiao! Thanks for all the memories!!!

I am shocked and in aw still...just can't believe It...Ironed chin pac man just got knocked out cold...amazing he fought all these bigass dudes and never really got hurt but jmm ko's him? just proves timing beats every thing...amazing